Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Crystallization Mechanism of Lithium Dislicate Glass with Various Particle Sizes

Lithium disilicate 유리의 입자크기에 따른 결정화 기구

  • Choi, Hyun Woo (Department of Nano Fusion Technology, Pusan National University) ;
  • Yoon, Hae Won (Department of Nano Fusion Technology, Pusan National University) ;
  • Yang, Yong Suk (Department of Nano Fusion Technology, Pusan National University) ;
  • Yoon, Su Jong (Department of Nano Fusion Technology, Pusan National University)
  • 최현우 (부산대학교 나노융합기술학과) ;
  • 윤혜원 (부산대학교 나노융합기술학과) ;
  • 양용석 (부산대학교 나노융합기술학과) ;
  • 윤수종 (부산대학교 나노융합기술학과)
  • Received : 2015.12.14
  • Accepted : 2015.12.28
  • Published : 2016.01.27
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Abstract

We have investigated the crystallization mechanism of the lithium disilicate ($Li_2O-2SiO_2$, LSO) glass particles with different sizes by isothermal and non-isothermal processes. The LSO glass was fabricated by rapid quenching of melt. X-ray diffraction and differential scanning calorimetry measurements were performed. Different crystallization models of Johnson-Mehl-Avrami, modified Ozawa and Arrhenius were adopted to analyze the thermal measurements. The activation energy E and the Avrami exponent n, which describe a crystallization mechanism, were obtained for three different glass particle sizes. Values of E and n for the glass particle with size under $45{\mu}m$, $75{\sim}106{\mu}m$, and $125{\sim}150{\mu}m$, were 2.28 eV, 2.21 eV, 2.19 eV, and ~1.5 for the isothermal process, respectively. Those values for the non-isothermal process were 2.4 eV, 2.3 eV, 2.2 eV, and ~1.3, for the isothermal process, respectively. The obtained values of the crystallization parameters indicate that the crystallization occurs through the decreasing nucleation rate with a diffusion controlled growth, irrespective to the particle sizes. It is also concluded that the smaller glass particles require the higher heat absorption to be crystallized.

Keywords

References

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